Method of grinding flat coil spring bands and a work holder therefor



June 13, 1950 H. J. DUESTER 2,511,700

METHOD OF GRINDING FLAT COIL SPRING BANDS AND A WORK HOLDER THEREFORFiled Aug. 30, 1948 4 Sheets-Sheet l flan fiat 4.

gwuwwtov Ha: I .0055 TEE ATTOR N EY June 13, 1950 H. J. DUESTER2,511,700

' METHOD OF GRINDING FLAT COIL SPRING BANDS AND A WORK HOLDER THEREFORFiled Aug. 30, 1948 4 Sheets-Sheet 2 mmvrozz. flew; .7. 0055 75K June13, 1950 H. J. DUESTER 2,511,700

METHOD OF GRINDING FLAT 0011. SPRING BANDS AND A WORK HOLDER THEREFOR 4Sheets-Sheet 3 Filed Aug. 30, 1948 INVENTOR.

flaw: .7. flaw-r512 Y June 13, 1950 H. J. DUESTER 2,511,700

RINDING F MET D OF G LAT COIL SPRING B S AND A WORK HOLDER THEREFORFiled Aug. 30, 1.948 4 Sheets-Sheet 4 mmvroR.

4: I DOA-675B BY fiat /2, 7 W

Patented June 13, 1950 -METHOD-OF GRINDING FLA'I' G011?SPRINGBANDS-ANDAKWORK HOLDER THEREFORE} to Hans hn estenQ ia o,- lle s imo icl imselt Q andJohnMajor, Chicago; Ill. Application August 30,19t8,"Serial:N o. 46,736:

wands. (c1. 51:42.17.) f

My invention relates: to. a n w: and im rcv sl method of grinding-matcoil: sprin bands an re workzholder therefor-r rinvention relates; more,particul r e a the method of grinding .flatcoil; spring handset. hetypeused. for ornamental purpq i fi such as ,3 tensibiezbands for.watchybrae l s or im la a ticles, choker necklaces or braceletsExtensible wristwatch bandsaand hra eletsn this typehave come into.popular ruse-v nr'l he t few years, the; same haringradt n a a over th rypes of bracelets. particullr c due 1505 their ease of attachment,orremoyal andpartiallysdue to decorative features which can be embodiedtherein.

The method which I-have devised and the work holder which I haveprovided therefor are adapted to be used in providing decorative groovesof various types in bands of this ,description, the grooves serving toenhance the ap pearance of the extensible spring bands.

The principal object of the present invention is to provide a new andimproved methodof grinding decorative grooves in coiled spring bands ofthe type described.

A further object of the invention-is to provide a new and improved workholder or fixture for holding flat bands of this type during thegrindingoperation thereon.

A further object of the invention .is to provide an improved work holderor fixture of the type described which is capable of holding one or morecoils of the extensible band in a lowered position, depressed below thesurface of others sethat alternate coils of the band may be ground,thereby creating varied decorative surfaceconfigurations in the completeband.

A further object of the invention'is to provide a work holder or fixtureof the type described by which such decorative grinding can be rapidlyand efiiciently done in a minimum of time and with such accuracy thatvolume production of decorative bands can be accomplished.

Other objects and advantages will be more apparent from the followingdescription wherein reference is had to the accompanying drawings, uponwhich 7 Fig. 1 is an enlarged fragmentary view of a portion of a flatcoiled spring band showing a plurality oi parallel grooves in alternatecoilsQof h and;

Fig. 2 is a cross-sectional view taken on the line 22.,of Fig. 1 showingthe grinding of vthe grooves in one of the coils;

3 a. sim a tres ctiona v ewaken s p me e indin a ls; mer ed a men r-plan .vi w 1E=-9e r n d ee dee mtive h sp teand; l eate F s 5 :i a c esr ecticna a nr nwthe i e 1-5 of} i t aw n the a ner n? w ich e oov r n-e-emuedr 1 -v 6 a i lar: s tion sw aken Onrthr r 15-1 11 s e lnes hemameri whi h t na v smcv sa e roue F a is rlanr iq qi he x reeo week mild r.i .=-Wh the xien i mil spr ne aes 9 be el -i r r nd ng r is re nerativeofrthe inin arh h. .=h;; mn ,e

F -r 45. ide e erat qna ie 2 e. we k helq r r fixer- "Fig.1 9 15 18.cross-sectional viewthereof .take onrthe ueee-e at F s- 8;:

Fie.- 10. is; an. enlarged. fra mentary sectional view; showing a:portion or the. mechanism shown in Fig. 9;

Fig;.11 is artragmentarp plan view thereof y and Figrlzis: a similarfragmentary plan view showing avmodified; construction wherein severalpar.-

-surfaces ;of tlfiec'oils [2, 14 eta, have surface 0 on a, fullsizeband,;which--isordinarilyotan grooves 18, the {grooves beingstaggered r so that inch'wide} the pl'a'cementor-the grooves as shown inthe enlarged -grooves -Figs.- 1 to 3 inclusive, give the appeararice ofa-chain design.

"The grooves arernade in the top surfaces oj e xier ie' @0 owrlvolutipns. by r n in whe Gm nted e a ie a dr in a mannerthatfiswell-lmownin the art.

In. h m nq ln zsrin ice w i I abor t q .es r he;al i pfii s roev 15 arer Place iat sshereate se ls it" it, etc, t e wards: thus z.q.. te hemehs d do n dur iathis rindin qneratlq i: I ar di ieree $e t r$ whichwill 1) ese n tly be pl ed th .0

against the-forward wall. ,of the post.v

it are ground in the top surfaces of the convolutions l2, l4, etc.

In Figs. 4 to 6 I have shown how the same method of grinding may beutilized where variations in the design or pattern are sought. Forexample, in the spring band 20 shown in Fig. 4 and consisting of theconvolutions 2|, 22, 23, 24, etc., each of the convolutions 2|, 23, etc.has a comparatively wide fiat groove 25'ground therein by the grindingwheel G, the alternate convolutions 22, 24, etc. being held down duringthis grinding operation and the tconvolutions 22, 24,

etc. having the elongatedugroove 2'! ground I therein by the grindingwheel in ,a diflerent setting when the alternate convolutions 2|.23,,etc.

are being held down.

From the above description of two diiferent throughout their'leng'th. Imount a pair of suspension and eliminating -jaws '38" and 40 on the topof the guide blocks 34 and 36 respectively, the same being fixedly heldin position by suitable holder on the arbor in the position shown inFigs. '7 and 9 and the operating lever 60 has been swung to the right(Fig. 7), the wedge lifter 48 will be moved forward and the separateconvolutions of the band will take the position shown in Fig. 9 andenlarged in Fig. 10. Referring to Fig. 10, it will be noticed that thedepressed convolutions l2 are wedged between the top surface of thelining arbor I0 and the suspension and eliminating jaws 38 and 40.

' The jaws, as best shown in Fig. 11, have alternate slots 82 and teeth84, the unlowered coils or convolutions reposing in the slots 82 and thelowered convolutions l2, l4, etc. being jammed by the teeth 84downwardly against the top of the lining arbor 10. In this condition thebottom portions of the coils or convolutions rest at screw members 42."I providea wedge 44'posi- I tioned for up and down movement in the spacebetween the guide blocks, the wedge being generally rectangular inshape, bu'thaving a top surface tapered from'the center outwardly toboth edges at approximately 5. Means for raising or lowering the wedgeblock may comprise the lifter member 48 which is also guided between theblocks 34 and 36 and has the tapered surface 50 which bears against thelowered tapered surface 52 of the wedge block.

Any lateral movement-of the wedge blockbetween the guide'blocks 34 and36 is prevented in the back end of the fixture by'the end post member 54which extends across the face of the ends of the guide blocks and 36-and at the front end of the fixture by a fastener block58 which isfastened to the front endiof block 34 and has a finger portion 58extending across the end of the wedge block 44 at its frontend.

Means for moving the wedge lifter 48 back and forth may comprisethepivoted lever 60 having a head 62 mounted-for rotation on a pin.fastened to the base-30." The head 82;mayhave an elongated slot 66adapted to receive an uprigh pin 68 on the end of the wedge lifter 48. Iy

To fixedly secure-an extensible chainbandB in position in the workholderso that alternate convolutions or coils may beraised for grindingand others depressed, I place the band on a lining arbor 10 shown inperspective in Fig. 'I-A. The liner 10 is a comparativelylongparalleledged strap having a fiat upper surface 'l2.and a lower surface14, which surface tapers upwardly from the center tobothedges at.approximately 2 The end ofthelining'arborhas seemicircular groove 16which, when thearbor .vvitha band mounted thereon is extended into thework holder, engages the..stop ,pin 18 mountedrupon the end post member54;,thefband' itself abutting when a band has been insertedinto th'ework an angle so that alternate convolutions rest against the taperedtop of the wedge block 44 and the tapered lower side of the lining arbor10. Thus it can be seen that alternate convolutions of the coiled springband are held depressed below the depth at which grinding of thedecorative grooves is desired, the grinding wheels G mounted upon asuitable driven shaft which may now be moved back and forth across thetop of the entire band, thus making the desired grooves in the topsurfaces of alternate convolutions.

After the operation has been completed, the

operating lever may be moved clockwise to release the wedge block, thelining arbor may be withdrawn with the band and the next band insertedfor the same operation.

" From the above and foregoin description it will be apparent to thoseskilled in the art that I have provided a comparatively simple yetefiicient and accurate method of grinding decorative grooves of the typedescribed as well as a highly efficient and accurate mechanism forcarrying out the method. By the use of this method and process, bands ofthis type can be accurately and quickly ground without injuring the-tensile strength of the material of which the bands are constructed ordisfiguring or in any way interfering with the function of the same asthey would function if the grinding operation had not taken place.

From the foregoing description itwill be obvious that by a variance inthe construction of the suspension and eliminating jaws differentdesigns may be produced with the same method and by the use of the samemechanism. For example, the teeth and spaces may be so defined that twoor three coils together will be depressed, permitting alternate groupsof more than one coil to be grooved with the same design, and then thegrooved convolutions may be depressed to permit a different design inthe unground convolutions. I

While I have illustrated and described a specific embodiment of theinvention and one other use for the same, it will be apparent to thoseskilled in 'the' art thatchanges and modifications may be made in theexact details shown and I do not wish to be limited in any particular;rather what I desire to secure and protect by Letters Patent of theUnited States is:

1. The method of decorating flat extensible spring coils which comprisesinserting a rigid filler strip into the coil partially to fill andrigidify the coil, applying upward pressure to the assembled coil andfiller. strip from below the assembly while simultaneously firmlyresisting such pressure from aboveevery other convolution of the coilalong the edges of the coil so that only the intermediate alternateconvolutions are raised above said first mentioned convolutions by theupward pressure and then cutting patterns in the raised exposed fiatfaces of the intermediate alternate convolutions, and then removing thefiller strip.

2. The method of decorating flat extensible spring coils which comprisesinserting a rigid filler strip into the coil partially to fill andrigidify the coil, applying upward pressure to the assembled coil andfiller strip from below the assembly while simultaneously firmlyresisting such pressure from above one or more spaced convolutions ofthe coil along the edges of the coil so that only the intermediatealternate convolutions between the aforementioned one or moreconvolutions are raised above said first mentioned spaced convolutionsby the upward pressure and then cutting patterns in the raised exposedflat faces of the intermediate alternate convolutions, and then removingthe filler strip.

3. A work holder for flat coiled springs comprising a base, spacedparallel walled guide blocks mounted on said base, a pair of similarlyshaped horizontally disposed jaw members fixedly mounted on said guideblocks, each of said jaw members having a row of spaced diagonallydirected teeth on one side wall, the jaw members so arranged on saidguide blocks that the rows of teeth are opposed and directed at an angletoward each other and a tapered channel is formed between said jawmembers, a wedge having parallel side walls mounted between said guideblocks, a wedge lifter slidably mounted below said wedge, said wedgelifter adapted when moved in a lateral direction to raise said wedgetoward said rows of spaced teeth, a fiat coiled spring positioned onsaid wedge, an elongated arbor telescopically mounted therein, saidcoiled spring adapted to be placed on said wedge to present alternatecoils of said band to the opposed rows of teeth to hold them againstmovement while adjacent coils are raised for grinding by movement ofsaid wedge lifter.

4. A work holder for flat coiled springs comprising a base, spacedparallel walled guide blocks mounted on said base, a pair of similarlyshaped horizontally disposed jaw members fixedly mounted on said guideblocks, each of said jaw members having a row of spaced diagonallydirected teeth on one side wall, the jaw members so arranged on saidguide blocks that the rows of teeth are opposed and directed at an angletoward each other and a tapered channel is formed between said jawmembers, a wedge having parallel side walls mounted between said guideblocks, a wedge lifter slidably mounted below said wedge, said wedgelifter adapted when moved in a lateral direction to raise said wedgetoward said rows of spaced teeth, a fiat coiled spring positioned onsaid wedge, an elongated arbor telescopically mounted therein, saidcoiled spring adapted to be placed on said wedge to present alternatecoils of said band to the opposed rows of teeth to hold them againstmovement while adjacent coils are raised for grinding by movement ofsaid wedge lifter, said wedge having a medial peak in its upper surfaceand said arbor being generally rectangular in cross-section and having amedial peak in its bottom surface whereby the bottom legs of alternatecoils of the band are rigidly clamped between the tapered surfaces ofthe top of said wedge and the bottom of said arbor to present alternatecoils of said spring raised above the rest of the coils.

HANS J. DUESTER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 638,835 Coran Dec. 12, 18991,335,247 Lask Mar. 30, 1920 1,779,053 Stoner Oct. 21, 1930 1,847,577Thompson Mar. 1, 1932 1,904,274 Crowley Apr. 18, 1933 1,935,147 DrexlerNov. 14, 1933 1,952,415 Brownlee Mar. 27, 1934 1,953,370 Starkey Apr. 3,1934 1,954,970 Wilson Apr. 17, 1934 2,019,398 Desagnat Oct. 29, 19352,221,885 Smithe et al. Nov. 19, 1940 2,244,223 Smithe et a1. June 3,1941 2,424,924 Chernow July 29, 1947 2,434,383 Benjamin Jan. 13, 1948

